docs: def _set_multi_bit_value_format_character(self):
          """ Set format character for multibit values.
  
          The format character depends on size of the value and whether values
          are signed or unsigned.
  
          """
          self.MULTI_BIT_VALUE_FORMAT_CHARACTER = \
              self.MULTI_BIT_VALUE_FORMAT_CHARACTER.upper()
  
          if self.SIGNED_VALUES:
              self.MULTI_BIT_VALUE_FORMAT_CHARACTER = \
                  self.MULTI_BIT_VALUE_FORMAT_CHARACTER.lower()